<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<meta http-equiv="X-UA-Compatible" content="ie=edge" />
	<title>响应式布局</title>
	<link rel="stylesheet" type="text/css" href="" media="(max-width:99px)"/><!-- 必须加小括号--> 
	<style type="text/css">
		@media only screen and (min-width: 100px) and (max-width: 640px) {
			body{
				background: pink;
			}
		}
		@media only screen and (min-width: 640px) and (max-width: 1920px) {
			body{
				background: skyblue;
			}
		}
	</style>
</head>
<body>
	
</body>
</html>